Title:
MULTILAYER OPTICAL RECORDING MEDIUM AND STORAGE
Document Type and Number:
WIPO Patent Application WO/2004/008448
Kind Code:
A1
Abstract:
A multilayer optical recording medium having recording layers for recording information comprises a first recording layer for recording&sol reproducing information by using a first light beam having a center wavelength &lgr 1, a first photochromic layer provided on the first recording layer, and a first optical waveguide layer provided on the first photochromic layer and adapted for applying a second light beam having a center wavelength &lgr 2 different from the center wavelength &lgr 1 to the first photochromic layer. The multilayer optical recording medium further comprises a second recording layer provided on the first optical waveguide layer and adapted for recording&sol reproducing information by using the first light beam, a second photochromic layer provided on the second recording layer, and a second optical waveguide layer provided on the second photochromic layer and adapted for applying the second light beam to the second photochromic layer. The first and second photochromic layers are turned transparent to the first light beam when receiving light or heat. The reflectance to the first light beam is improved by application of the second light beam, thereby improving the reflectance and enabling repetition of transparentization.
Inventors:
TAWA FUMIHIRO (JP)
Application Number:
PCT/JP2002/007210
Publication Date:
January 22, 2004
Filing Date:
July 16, 2002
Export Citation:
Assignee:
FUJITSU LTD (JP)
TAWA FUMIHIRO (JP)
TAWA FUMIHIRO (JP)
International Classes:
G03C11/00; G11B7/004; G11B7/0045; G11B7/09; G11B7/24038; G11B7/125; G11B7/1275; G11B7/1392; G11B7/00; G11B7/135; (IPC1-7): G11B7/24; G11B7/0045; G11B7/135; G11B7/125; G11B7/09
Foreign References:
| JPH11345419A | 1999-12-14 | |||
| JP2000149318A | 2000-05-30 | |||
| JP2000149323A | 2000-05-30 | |||
| JPH0896406A | 1996-04-12 | |||
| US5268862A | 1993-12-07 | |||
| US5325324A | 1994-06-28 | |||
| JPH08315413A | 1996-11-29 |
Other References:
See also references of EP 1523000A4
Attorney, Agent or Firm:
Matsumoto, Takashi (Almond Akasaka Building 9th Floor 2-2, Akasaka 3-chom, Minato-ku Tokyo, JP)
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